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-rw-r--r--trunk/src/emu/sound/ics2115.c894
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diff --git a/trunk/src/emu/sound/ics2115.c b/trunk/src/emu/sound/ics2115.c
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+//ICS2115 by Raiden II team (c) 2010
+//members: austere, nimitz, trap15
+//
+//Original driver by O. Galibert, ElSemi
+//
+//Use tab size = 4 for your viewing pleasure.
+
+#include "emu.h"
+#include "ics2115.h"
+#include <cmath>
+
+//#define ICS2115_DEBUG
+//#define ICS2115_ISOLATE 6
+
+// device type definition
+const device_type ICS2115 = &device_creator<ics2115_device>;
+
+void ics2115_device::static_set_irqf(device_t &device, void (*irqf)(device_t *device, int state))
+{
+ ics2115_device &ics2115 = downcast<ics2115_device &>(device);
+ ics2115.m_irq_cb = irqf;
+}
+
+ics2115_device::ics2115_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, ICS2115, "ICS2115", tag, owner, clock),
+ device_sound_interface(mconfig, *this),
+ m_irq_cb(NULL)
+{
+}
+
+void ics2115_device::device_start()
+{
+ m_rom = *region();
+ m_timer[0].timer = machine().scheduler().timer_alloc(FUNC(timer_cb_0), this);
+ m_timer[1].timer = machine().scheduler().timer_alloc(FUNC(timer_cb_1), this);
+ m_stream = machine().sound().stream_alloc(*this, 0, 2, 33075);
+
+ //Exact formula as per patent 5809466
+ //This seems to give the ok fit but it is not good enough.
+ /*double maxvol = ((1 << volume_bits) - 1) * pow(2., (double)1/0x100);
+ for (int i = 0; i < 0x1000; i++) {
+ m_volume[i] = floor(maxvol * pow(2.,(double)i/256 - 16) + 0.5);
+ }*/
+
+ //austere's table, derived from patent 5809466:
+ //See section V starting from page 195
+ //Subsection F (column 124, page 198) onwards
+ for (int i = 0; i<4096; i++) {
+ m_volume[i] = ((0x100 | (i & 0xff)) << (volume_bits-9)) >> (15 - (i>>8));
+ }
+
+ //u-Law table as per MIL-STD-188-113
+ UINT16 lut[8];
+ UINT16 lut_initial = 33 << 2; //shift up 2-bits for 16-bit range.
+ for(int i = 0; i < 8; i++)
+ lut[i] = (lut_initial << i) - lut_initial;
+ for(int i = 0; i < 256; i++) {
+ UINT8 exponent = (~i >> 4) & 0x07;
+ UINT8 mantissa = ~i & 0x0f;
+ INT16 value = lut[exponent] + (mantissa << (exponent + 3));
+ m_ulaw[i] = (i & 0x80) ? -value : value;
+ }
+
+ save_item(NAME(m_timer[0].period));
+ save_item(NAME(m_timer[0].scale));
+ save_item(NAME(m_timer[0].preset));
+ save_item(NAME(m_timer[1].period));
+ save_item(NAME(m_timer[1].scale));
+ save_item(NAME(m_timer[1].preset));
+ save_item(NAME(m_reg_select));
+ save_item(NAME(m_osc_select));
+ save_item(NAME(m_irq_enabled));
+ save_item(NAME(m_irq_pending));
+ save_item(NAME(m_irq_on));
+ save_item(NAME(m_active_osc));
+ save_item(NAME(m_vmode));
+
+ for(int i = 0; i < 32; i++) {
+ save_item(NAME(m_voice[i].osc_conf.value), i);
+ save_item(NAME(m_voice[i].state.value), i);
+ save_item(NAME(m_voice[i].vol_ctrl.value), i);
+ save_item(NAME(m_voice[i].osc.left), i);
+ save_item(NAME(m_voice[i].osc.acc), i);
+ save_item(NAME(m_voice[i].osc.start), i);
+ save_item(NAME(m_voice[i].osc.end), i);
+ save_item(NAME(m_voice[i].osc.fc), i);
+ save_item(NAME(m_voice[i].osc.ctl), i);
+ save_item(NAME(m_voice[i].osc.saddr), i);
+ save_item(NAME(m_voice[i].vol.left), i);
+ save_item(NAME(m_voice[i].vol.add), i);
+ save_item(NAME(m_voice[i].vol.start), i);
+ save_item(NAME(m_voice[i].vol.end), i);
+ save_item(NAME(m_voice[i].vol.acc), i);
+ save_item(NAME(m_voice[i].vol.regacc), i);
+ save_item(NAME(m_voice[i].vol.incr), i);
+ save_item(NAME(m_voice[i].vol.pan), i);
+ save_item(NAME(m_voice[i].vol.mode), i);
+ }
+}
+
+
+void ics2115_device::device_reset()
+{
+ m_irq_enabled = 0;
+ m_irq_pending = 0;
+ //possible re-suss
+ m_active_osc = 31;
+ m_osc_select = 0;
+ m_reg_select = 0;
+ m_vmode = 0;
+ memset(m_voice, 0, sizeof(m_voice));
+ m_timer[0].timer->adjust(attotime::never);
+ m_timer[1].timer->adjust(attotime::never);
+ m_timer[0].period = 0;
+ m_timer[1].period = 0;
+ for(int i = 0; i < 32; i++) {
+ m_voice[i].osc_conf.value = 2;
+ m_voice[i].osc.fc = 0;
+ m_voice[i].osc.acc = 0;
+ m_voice[i].osc.start = 0;
+ m_voice[i].osc.end = 0;
+ m_voice[i].osc.ctl = 0;
+ m_voice[i].osc.saddr = 0;
+ m_voice[i].vol.acc = 0;
+ m_voice[i].vol.incr = 0;
+ m_voice[i].vol.start = 0;
+ m_voice[i].vol.end = 0;
+ m_voice[i].vol.pan = 0x7F;
+ m_voice[i].vol_ctrl.value = 1;
+ m_voice[i].vol.mode = 0;
+ m_voice[i].state.value = 0;
+ }
+}
+
+//TODO: improve using next-state logic from column 126 of patent 5809466
+int ics2115_voice::update_volume_envelope()
+{
+ int ret = 0;
+ if(vol_ctrl.done || vol_ctrl.stop)
+ return ret;
+
+ if(vol_ctrl.invert) {
+ vol.acc -= vol.add;
+ vol.left = vol.acc - vol.start;
+ } else {
+ vol.acc += vol.add;
+ vol.left = vol.end - vol.acc;
+ }
+
+ if(vol.left > 0)
+ return ret;
+
+ if(vol_ctrl.irq) {
+ vol_ctrl.irq_pending = true;
+ ret = 1;
+ }
+
+ if(osc_conf.eightbit)
+ return ret;
+
+ if(vol_ctrl.loop) {
+ if(vol_ctrl.loop_bidir)
+ vol_ctrl.invert = !vol_ctrl.invert;
+
+ if(vol_ctrl.invert)
+ vol.acc = vol.end + vol.left;
+ else
+ vol.acc = vol.start - vol.left;
+ } else {
+ state.on = false;
+ vol_ctrl.done = true;
+ if(vol_ctrl.invert)
+ vol.acc = vol.end;
+ else
+ vol.acc = vol.start;
+ }
+
+ return ret;
+}
+
+/*UINT32 ics2115_voice::next_address()
+{
+ //Patent 6,246,774 B1, Column 111, Row 25
+ //LEN BLEN DIR BC NextAddress
+ //x x 0 0 add+fc
+ //x x 1 0 add-fc
+ //0 x x 1 add
+ //1 0 0 1 start-(end-(add+fc))
+ //1 0 1 1 end+((add+fc)-start)
+ //1 1 0 1 end+(end-(add+fc))
+ //1 1 1 1 start-((add-fc)-start)
+
+}*/
+
+
+int ics2115_voice::update_oscillator()
+{
+ int ret = 0;
+ if(osc_conf.stop)
+ return ret;
+ if(osc_conf.invert) {
+ osc.acc -= osc.fc << 2;
+ osc.left = osc.acc - osc.start;
+ } else {
+ osc.acc += osc.fc << 2;
+ osc.left = osc.end - osc.acc;
+ }
+ // > instead of >= to stop crackling?
+ if(osc.left > 0)
+ return ret;
+ if(osc_conf.irq) {
+ osc_conf.irq_pending = true;
+ ret = 1;
+ }
+ if(osc_conf.loop) {
+ if(osc_conf.loop_bidir)
+ osc_conf.invert = !osc_conf.invert;
+ //else
+ // printf("click!\n");
+
+ if(osc_conf.invert) {
+ osc.acc = osc.end + osc.left;
+ osc.left = osc.acc - osc.start;
+ }
+ else {
+ osc.acc = osc.start - osc.left;
+ osc.left = osc.end - osc.acc;
+ }
+ } else {
+ state.on = false;
+ osc_conf.stop = true;
+ if(!osc_conf.invert)
+ osc.acc = osc.end;
+ else
+ osc.acc = osc.start;
+ }
+ return ret;
+}
+
+//TODO: proper interpolation for uLaw (fill_output doesn't use this) and 8-bit samples (looping)
+stream_sample_t ics2115_device::get_sample(ics2115_voice& voice)
+{
+ UINT32 curaddr = ((voice.osc.saddr << 20) & 0xffffff) | (voice.osc.acc >> 12);
+ UINT32 nextaddr;
+
+ if (voice.state.on && voice.osc_conf.loop && !voice.osc_conf.loop_bidir &&
+ (voice.osc.left < (voice.osc.fc <<2))) {
+ //printf("C?[%x:%x]", voice.osc.left, voice.osc.acc);
+ nextaddr = ((voice.osc.saddr << 20) & 0xffffff) | (voice.osc.start >> 12);
+ }
+ else
+ nextaddr = curaddr + 2;
+
+
+ INT16 sample1, sample2;
+ if (voice.osc_conf.eightbit) {
+ sample1 = ((INT8)m_rom[curaddr]) << 8;
+ sample2 = ((INT8)m_rom[curaddr + 1]) << 8;
+ }
+ else {
+ sample1 = m_rom[curaddr + 0] | (((INT8)m_rom[curaddr + 1]) << 8);
+ sample2 = m_rom[nextaddr+ 0] | (((INT8)m_rom[nextaddr+ 1]) << 8);
+ //sample2 = m_rom[curaddr + 2] | (((INT8)m_rom[curaddr + 3]) << 8);
+ }
+
+ //no need for interpolation since it's around 1 note a cycle?
+ //if(voice.osc.fc >> 10)
+ // return sample1;
+
+ //linear interpolation as in US patent 6,246,774 B1, column 2 row 59
+ //LEN=1, BLEN=0, DIR=0, start+end interpolation
+ INT32 sample, diff;
+ UINT16 fract;
+ diff = sample2 - sample1;
+ fract = (voice.osc.acc >> 3) & 0x1ff;
+
+ sample = (((INT32)sample1 << 9) + diff * fract) >> 9;
+ //sample = sample1;
+ return sample;
+}
+
+bool ics2115_voice::playing()
+{
+ return state.on && !((vol_ctrl.done || vol_ctrl.stop) && osc_conf.stop);
+}
+
+void ics2115_voice::update_ramp() {
+ //slow attack
+ if (state.on && !osc_conf.stop) {
+ if (state.ramp < 0x40)
+ state.ramp += 0x1;
+ else
+ state.ramp = 0x40;
+ }
+ //slow release
+ else {
+ if (state.ramp)
+ state.ramp -= 0x1;
+ }
+}
+
+int ics2115_device::fill_output(ics2115_voice& voice, stream_sample_t *outputs[2], int samples)
+{
+ bool irq_invalid = false;
+ UINT16 fine = 1 << (3*(voice.vol.incr >> 6));
+ voice.vol.add = (voice.vol.incr & 0x3F)<< (10 - fine);
+
+ for (int i = 0; i < samples; i++) {
+ UINT32 volacc = (voice.vol.acc >> 10) & 0xffff;
+ UINT32 volume = (m_volume[volacc >> 4] * voice.state.ramp) >> 6;
+ UINT16 vleft = volume; //* (255 - voice.vol.pan) / 0x80];
+ UINT16 vright = volume; //* (voice.vol.pan + 1) / 0x80];
+
+ //From GUS doc:
+ //In general, it is necessary to remember that all voices are being summed in to the
+ //final output, even if they are not running. This means that whatever data value
+ //that the voice is pointing at is contributing to the summation.
+ //(austere note: this will of course fix some of the glitches due to multiple transition)
+ stream_sample_t sample;
+ if(voice.osc_conf.ulaw) {
+ UINT32 curaddr = ((voice.osc.saddr << 20) & 0xffffff) | (voice.osc.acc >> 12);
+ sample = m_ulaw[m_rom[curaddr]];
+ }
+ else
+ sample = get_sample(voice);
+
+ //15-bit volume + (5-bit worth of 32 channel sum) + 16-bit samples = 4-bit extra
+ if (!m_vmode || voice.playing()) {
+ //if (voice.playing()) {
+ outputs[0][i] += (sample * vleft) >> (5 + volume_bits - 16);
+ outputs[1][i] += (sample * vright) >> (5 + volume_bits - 16);
+ }
+
+ voice.update_ramp();
+ if (voice.playing()) {
+ if (voice.update_oscillator())
+ irq_invalid = true;
+ if (voice.update_volume_envelope())
+ irq_invalid = true;
+ }
+ }
+ return irq_invalid;
+}
+
+void ics2115_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
+{
+ memset(outputs[0], 0, samples * sizeof(stream_sample_t));
+ memset(outputs[1], 0, samples * sizeof(stream_sample_t));
+
+ bool irq_invalid = false;
+ for(int osc = 0; osc <= m_active_osc; osc++) {
+ ics2115_voice& voice = m_voice[osc];
+
+#ifdef ICS2115_ISOLATE
+ if(osc != ICS2115_ISOLATE)
+ continue;
+#endif
+/*
+#ifdef ICS2115_DEBUG
+ UINT32 curaddr = ((voice.osc.saddr << 20) & 0xffffff) | (voice.osc.acc >> 12);
+ stream_sample_t sample;
+ if(voice.osc_conf.ulaw)
+ sample = m_ulaw[m_rom[curaddr]];
+ else
+ sample = get_sample(voice);
+ printf("[%06x=%04x]", curaddr, (INT16)sample);
+#endif
+*/
+ if(fill_output(voice, outputs, samples))
+ irq_invalid = true;
+
+#ifdef ICS2115_DEBUG
+ if(voice.playing()) {
+ printf("%d", osc);
+ if (voice.osc_conf.invert)
+ printf("+");
+ else if ((voice.osc.fc >> 1) > 0x1ff)
+ printf("*");
+ printf(" ");
+
+ /*int min = 0x7fffffff, max = 0x80000000;
+ double average = 0;
+ for (int i = 0; i < samples; i++) {
+ if (outputs[0][i] > max) max = outputs[0][i];
+ if (outputs[0][i] < min) min = outputs[0][i];
+ average += fabs(outputs[0][i]);
+ }
+ average /= samples;
+ average /= 1 << 16;
+ printf("<Mi:%d Mx:%d Av:%g>", min >> 16, max >> 16, average);*/
+ }
+#endif
+ }
+
+#ifdef ICS2115_DEBUG
+ printf("|");
+#endif
+
+ //rescale
+ for (int i = 0; i < samples; i++) {
+ outputs[0][i] >>= 16;
+ outputs[1][i] >>= 16;
+ }
+
+ if(irq_invalid)
+ recalc_irq();
+
+}
+
+//Helper Function (Reads off current register)
+UINT16 ics2115_device::reg_read() {
+ UINT16 ret;
+ ics2115_voice& voice = m_voice[m_osc_select];
+
+ switch(m_reg_select) {
+ case 0x00: // [osc] Oscillator Configuration
+ ret = voice.osc_conf.value;
+ ret <<= 8;
+ break;
+
+ case 0x01: // [osc] Wavesample frequency
+ // freq = fc*33075/1024 in 32 voices mode, fc*44100/1024 in 24 voices mode
+ //ret = v->Osc.FC;
+ ret = voice.osc.fc;
+ break;
+
+ case 0x02: // [osc] Wavesample loop start high
+ //TODO: are these returns valid? might be 0x00ff for this one...
+ ret = (voice.osc.start >> 16) & 0xffff;
+ break;
+
+ case 0x03: // [osc] Wavesample loop start low
+ ret = (voice.osc.start >> 0) & 0xff00;
+ break;
+
+ case 0x04: // [osc] Wavesample loop end high
+ ret = (voice.osc.end >> 16) & 0xffff;
+ break;
+
+ case 0x05: // [osc] Wavesample loop end low
+ ret = (voice.osc.end >> 0) & 0xff00;
+ break;
+
+ case 0x06: // [osc] Volume Increment
+ ret = voice.vol.incr;
+ break;
+
+ case 0x07: // [osc] Volume Start
+ ret = voice.vol.start >> (10+8);
+ break;
+
+ case 0x08: // [osc] Volume End
+ ret = voice.vol.end >> (10+8);
+ break;
+
+ case 0x09: // [osc] Volume accumulator
+ //ret = v->Vol.Acc;
+ ret = voice.vol.acc >> (10);
+ break;
+
+ case 0x0A: // [osc] Wavesample address
+ ret = (voice.osc.acc >> 16) & 0xffff;
+ break;
+
+ case 0x0B: // [osc] Wavesample address
+ ret = (voice.osc.acc >> 0) & 0xfff8;
+ break;
+
+
+ case 0x0C: // [osc] Pan
+ ret = voice.vol.pan << 8;
+ break;
+
+ /* DDP3 code (trap15's reversal) */
+ /* 0xA13's work:
+ res = read() & 0xC3;
+ if(!(res & 2)) res |= 1;
+ e = d = res;
+ */
+ /* 0xA4F's work:
+ while(!(read() & 1))
+ */
+ case 0x0D: // [osc] Volume Envelope Control
+ //ret = v->Vol.Ctl | ((v->state & FLAG_STATE_VOLIRQ) ? 0x81 : 1);
+ // may expect |8 on voice irq with &40 == 0
+ // may expect |8 on reg 0 on voice irq with &80 == 0
+ // ret = 0xFF;
+ if (!m_vmode)
+ ret = voice.vol_ctrl.irq ? 0x81 : 0x01;
+ else
+ ret = 0x01;
+ //ret = voice.vol_ctrl.value | 0x1;
+ ret <<= 8;
+ break;
+
+ case 0x0E: // Active Voices
+ ret = m_active_osc;
+ break;
+
+ case 0x0F:{// [osc] Interrupt source/oscillator
+ ret = 0xff;
+ for (int i = 0; i <= m_active_osc; i++) {
+ ics2115_voice& v = m_voice[i];
+ if (v.osc_conf.irq_pending || v.vol_ctrl.irq_pending) {
+ ret = i | 0xe0;
+ ret &= v.vol_ctrl.irq_pending ? (~0x40) : 0xff;
+ ret &= v.osc_conf.irq_pending ? (~0x80) : 0xff;
+ recalc_irq();
+ if (v.osc_conf.irq_pending) {
+ v.osc_conf.irq_pending = 0;
+ ret &= ~0x80;
+ }
+ if (v.vol_ctrl.irq_pending) {
+ v.vol_ctrl.irq_pending = 0;
+ ret &= ~0x40;
+ }
+ break;
+ }
+ }
+ ret <<= 8;
+ break;}
+
+ case 0x10: // [osc] Oscillator Control
+ ret = voice.osc.ctl << 8;
+ break;
+
+ case 0x11: // [osc] Wavesample static address 27-20
+ ret = voice.osc.saddr << 8;
+ break;
+
+ case 0x40: // Timer 0 clear irq
+ case 0x41: // Timer 1 clear irq
+ //TODO: examine this suspect code
+ ret = m_timer[m_reg_select & 0x1].preset;
+ m_irq_pending &= ~(1 << (m_reg_select & 0x1));
+ recalc_irq();
+ break;
+
+ case 0x43: // Timer status
+ ret = m_irq_pending & 3;
+ break;
+
+ case 0x4A: // IRQ Pending
+ ret = m_irq_pending;
+ break;
+
+ case 0x4B: // Address of Interrupting Oscillator
+ ret = 0x80;
+ break;
+
+ case 0x4C: // Chip Revision
+ ret = revision;
+ break;
+
+ default:
+#ifdef ICS2115_DEBUG
+ printf("ICS2115: Unhandled read %x\n", m_reg_select);
+#endif
+ ret = 0;
+ break;
+ }
+ return ret;
+}
+
+void ics2115_device::reg_write(UINT8 data, bool msb) {
+ ics2115_voice& voice = m_voice[m_osc_select];
+
+ switch(m_reg_select) {
+ case 0x00: // [osc] Oscillator Configuration
+ if(msb) {
+ voice.osc_conf.value &= 0x80;
+ voice.osc_conf.value |= data & 0x7f;
+ }
+ break;
+
+ case 0x01: // [osc] Wavesample frequency
+ // freq = fc*33075/1024 in 32 voices mode, fc*44100/1024 in 24 voices mode
+ if(msb)
+ voice.osc.fc = (voice.osc.fc & 0x00ff) | (data << 8);
+ else
+ //last bit not used!
+ voice.osc.fc = (voice.osc.fc & 0xff00) | (data & 0xfe);
+ break;
+
+ case 0x02: // [osc] Wavesample loop start high
+ if(msb)
+ voice.osc.start = (voice.osc.start & 0x00ffffff) | (data << 24);
+ else
+ voice.osc.start = (voice.osc.start & 0xff00ffff) | (data << 16);
+ break;
+
+ case 0x03: // [osc] Wavesample loop start low
+ if(msb)
+ voice.osc.start = (voice.osc.start & 0xffff00ff) | (data << 8);
+ // This is unused?
+ //else
+ //voice.osc.start = (voice.osc.start & 0xffffff00) | (data & 0);
+ break;
+
+ case 0x04: // [osc] Wavesample loop end high
+ if(msb)
+ voice.osc.end = (voice.osc.end & 0x00ffffff) | (data << 24);
+ else
+ voice.osc.end = (voice.osc.end & 0xff00ffff) | (data << 16);
+ break;
+
+ case 0x05: // [osc] Wavesample loop end low
+ if(msb)
+ voice.osc.end = (voice.osc.end & 0xffff00ff) | (data << 8);
+ // lsb is unused?
+ break;
+
+ case 0x06: // [osc] Volume Increment
+ if(msb)
+ voice.vol.incr = data;
+ break;
+
+ case 0x07: // [osc] Volume Start
+ if (!msb)
+ voice.vol.start = data << (10+8);
+ break;
+
+ case 0x08: // [osc] Volume End
+ if (!msb)
+ voice.vol.end = data << (10+8);
+ break;
+
+ case 0x09: // [osc] Volume accumulator
+ if(msb)
+ voice.vol.regacc = (voice.vol.regacc & 0x00ff) | (data << 8);
+ else
+ voice.vol.regacc = (voice.vol.regacc & 0xff00) | data;
+ voice.vol.acc = voice.vol.regacc << 10;
+ break;
+
+ case 0x0A: // [osc] Wavesample address high
+#ifdef ICS2115_DEBUG
+#ifdef ICS2115_ISOLATE
+ if(m_osc_select == ICS2115_ISOLATE)
+#endif
+ printf("<%d:oa:H[%d]=%x>", m_osc_select, msb, data);
+#endif
+ if(msb)
+ voice.osc.acc = (voice.osc.acc & 0x00ffffff) | (data << 24);
+ else
+ voice.osc.acc = (voice.osc.acc & 0xff00ffff) | (data << 16);
+ break;
+
+ case 0x0B: // [osc] Wavesample address low
+#ifdef ICS2115_DEBUG
+#ifdef ICS2115_ISOLATE
+ if(m_osc_select == ICS2115_ISOLATE)
+#endif
+ printf("<%d:oa:L[%d]=%x>", m_osc_select, msb, data);
+#endif
+ if(msb)
+ voice.osc.acc = (voice.osc.acc & 0xffff00ff) | (data << 8);
+ else
+ voice.osc.acc = (voice.osc.acc & 0xffffff00) | (data & 0xF8);
+ break;
+
+ case 0x0C: // [osc] Pan
+ if(msb)
+ voice.vol.pan = data;
+ break;
+
+ case 0x0D: // [osc] Volume Envelope Control
+ if(msb) {
+ voice.vol_ctrl.value &= 0x80;
+ voice.vol_ctrl.value |= data & 0x7F;
+ }
+ break;
+
+ case 0x0E: // Active Voices
+ //Does this value get added to 1? Not sure. Could trace for writes of 32.
+ if(msb) {
+ m_active_osc = data & 0x1F; // & 0x1F ? (Guessing)
+ }
+ break;
+ //2X8 ?
+ case 0x10: // [osc] Oscillator Control
+ //Could this be 2X9?
+ //[7 R | 6 M2 | 5 M1 | 4-2 Reserve | 1 - Timer 2 Strt | 0 - Timer 1 Strt]
+
+ if (msb) {
+ voice.osc.ctl = data;
+ if (!data)
+ keyon();
+ //guessing here
+ else if(data == 0xf) {
+#ifdef ICS2115_DEBUG
+#ifdef ICS2115_ISOLATE
+ if (m_osc_select == ICS2115_ISOLATE)
+#endif
+ if (!voice.osc_conf.stop || !voice.vol_ctrl.stop)
+ printf("[%02d STOP]\n", m_osc_select);
+#endif
+ if (!m_vmode) {
+ voice.osc_conf.stop = true;
+ voice.vol_ctrl.stop = true;
+ //try to key it off as well!
+ voice.state.on = false;
+ }
+ }
+#ifdef ICS2115_DEBUG
+ else
+ printf("ICS2115: Unhandled* data write %d onto 0x10.\n", data);
+#endif
+ }
+ break;
+
+ case 0x11: // [osc] Wavesample static address 27-20
+ if(msb)
+ //v->Osc.SAddr = data;
+ voice.osc.saddr = data;
+ break;
+ case 0x12:
+ //Could be per voice! -- investigate.
+ if (msb)
+ m_vmode = data;
+ break;
+ case 0x40: // Timer 1 Preset
+ case 0x41: // Timer 2 Preset
+ if(!msb) {
+ m_timer[m_reg_select & 0x1].preset = data;
+ recalc_timer(m_reg_select & 0x1);
+ }
+ break;
+
+ case 0x42: // Timer 1 Prescale
+ case 0x43: // Timer 2 Prescale
+ if(!msb) {
+ m_timer[m_reg_select & 0x1].scale = data;
+ recalc_timer(m_reg_select & 0x1);
+ }
+ break;
+
+ case 0x4A: // IRQ Enable
+ if(!msb) {
+ m_irq_enabled = data;
+ recalc_irq();
+ }
+ break;
+
+ case 0x4F: // Oscillator Address being Programmed
+ if(!msb) {
+ m_osc_select = data % (1+m_active_osc);
+ }
+ break;
+ default:
+#ifdef ICS2115_DEBUG
+ printf("ICS2115: Unhandled write %x onto %x(%d) [voice = %d]\n", data, m_reg_select, msb, m_osc_select);
+#endif
+ break;
+ }
+}
+
+//UINT8 ics2115_device::read (offs_t offset)
+READ8_DEVICE_HANDLER(ics2115_device::read)
+{
+ ics2115_device *chip = downcast<ics2115_device *>(device);
+ UINT8 ret = 0;
+
+ switch(offset) {
+ case 0:
+ //TODO: check this suspect code
+ if (chip->m_irq_on) {
+ ret |= 0x80;
+ if (chip->m_irq_enabled && (chip->m_irq_pending & 3))
+ ret |= 1;
+ for (int i = 0; i <= chip->m_active_osc; i++) {
+ if (//chip->m_voice[i].vol_ctrl.irq_pending ||
+ chip->m_voice[i].osc_conf.irq_pending) {
+ ret |= 2;
+ break;
+ }
+ }
+ }
+
+ break;
+ case 1:
+ ret = chip->m_reg_select;
+ break;
+ case 2:
+ ret = (UINT8)(chip->reg_read());
+ break;
+ case 3:
+ ret = chip->reg_read() >> 8;
+ break;
+ default:
+#ifdef ICS2115_DEBUG
+ printf("ICS2115: Unhandled memory read at %x\n", offset);
+#endif
+ break;
+ }
+ return ret;
+}
+
+//UINT8 ics2115_device::write(offs_t offset, UINT8 data)
+WRITE8_DEVICE_HANDLER(ics2115_device::write)
+{
+ ics2115_device *chip = downcast<ics2115_device *>(device);
+ switch(offset) {
+ case 1:
+ chip->m_reg_select = data;
+ break;
+ case 2:
+ chip->reg_write(data,0);
+ break;
+ case 3:
+ chip->reg_write(data,1);
+ break;
+ default:
+#ifdef ICS2115_DEBUG
+ printf("ICS2115: Unhandled memory write %02x to %x\n", data, offset);
+#endif
+ break;
+ }
+}
+
+void ics2115_device::keyon()
+{
+#ifdef ICS2115_ISOLATE
+ if (m_osc_select != ICS2115_ISOLATE)
+ return;
+#endif
+ //set initial condition (may need to invert?) -- does NOT work since these are set to zero even
+ m_voice[m_osc_select].state.on = true;
+ //no ramp up...
+ m_voice[m_osc_select].state.ramp = 0x40;
+
+#ifdef ICS2115_DEBUG
+ printf("[%02d vs:%04x ve:%04x va:%04x vi:%02x vc:%02x os:%06x oe:%06x oa:%06x of:%04x SA:%02x oc:%02x][%04x]\n", m_osc_select,
+ m_voice[m_osc_select].vol.start >> 10,
+ m_voice[m_osc_select].vol.end >> 10,
+ m_voice[m_osc_select].vol.acc >> 10,
+ m_voice[m_osc_select].vol.incr,
+ m_voice[m_osc_select].vol_ctrl.value,
+ m_voice[m_osc_select].osc.start >> 12,
+ m_voice[m_osc_select].osc.end >> 12,
+ m_voice[m_osc_select].osc.acc >> 12,
+ m_voice[m_osc_select].osc.fc,
+ m_voice[m_osc_select].osc.saddr,
+ m_voice[m_osc_select].osc_conf.value,
+ m_volume[(m_voice[m_osc_select].vol.acc >> 14)]
+ );
+#endif
+ //testing memory corruption issue with mame stream
+ //printf("m_volume[0x%x]=0x%x\n", mastervolume, m_volume[mastervolume]);
+}
+
+void ics2115_device::recalc_irq()
+{
+ //Suspect
+ bool irq = (m_irq_pending & m_irq_enabled);
+ for(int i = 0; (!irq) && (i < 32); i++)
+ irq |= m_voice[i].vol_ctrl.irq_pending && m_voice[i].osc_conf.irq_pending;
+ m_irq_on = irq;
+ if(m_irq_cb)
+ m_irq_cb(this, irq ? ASSERT_LINE : CLEAR_LINE);
+}
+
+TIMER_CALLBACK( ics2115_device::timer_cb_0 )
+{
+ ics2115_device *chip = (ics2115_device *)ptr;
+ chip->m_irq_pending |= 1 << 0;
+ chip->recalc_irq();
+}
+
+TIMER_CALLBACK( ics2115_device::timer_cb_1 )
+{
+ ics2115_device *chip = (ics2115_device *)ptr;
+ chip->m_irq_pending |= 1 << 1;
+ chip->recalc_irq();
+}
+
+void ics2115_device::recalc_timer(int timer)
+{
+ //Old regression-based formula (minus constant)
+ //UINT64 period = m_timer[timer].preset * (m_timer[timer].scale << 16) / 60;
+
+ //New formula based on O.Galibert's reverse engineering of ICS2115 card firmware
+ UINT64 period = ((m_timer[timer].scale & 0x1f) + 1) * (m_timer[timer].preset + 1);
+ period = (period << (4 + (m_timer[timer].scale >> 5)))*78125/2646;
+
+ if(m_timer[timer].period != period) {
+ m_timer[timer].period = period;
+ // Adjust the timer lengths
+ if(period) // Reset the length
+ m_timer[timer].timer->adjust(attotime::from_nsec(period), 0, attotime::from_nsec(period));
+ else // Kill the timer if length == 0
+ m_timer[timer].timer->adjust(attotime::never);
+ }
+}